What is up with the green valve stem caps
 

Picked up my car last night looks great but whats up with the green valve stem caps,I was told that it was to tell the dealer that the wheels are filled with nitrogen instead of air.

If you guys know the answer I would like to here from you.

Green caps are normally placed to signify that the tires are filled with nitrogen.

Thanks,

Now do I leave them on their or change them?

i would definitely change them unless you're a TEIN salesman or something. :D

Mine actually had quite a gap and when I tried to tighten them they all cracked. So I have black ones now.

I think you can get metal caps with green dot if you still want to signify that the tires are filled with nitrogen.